JP2002018814A - Method for molding bar-like timber and mold for molding used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a simplification of a mold for molding in a method for molding the steps of molding a bar-like timber reduced in diameter as compared with the timber by radially pressurizing the timber of a state in which the timber is maintained in a predetermined water-containing degree and heated to a predetermined temperature. SOLUTION: The method for molding the bar-like timber by using a cylindrical mold having a tapered inner surface of a size for radially reducing in diameter the timber or the like comprises a first step of inserting the timber in a depth coincided with the tapered inner surface from a large inner diameter open end of the mold, a second step of cooling the timber by maintaining the timber in a state in which the timber is inserted, and a third step of pressing out a product timber after molding by a push bar from the small inner diameter side open end of the mold after the second step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for compression-molding wood to compress wood into a fixed cross-sectional shape, and a molding die used for the method.

[0002]

2. Description of the Related Art As a compression molding method of this kind,
The invention of Japanese Patent No. 2868877 (disclosed on December 21, 1993) has been proposed. In this method, a wooden log material is heated to a predetermined temperature in a pressure device, and the heated log material is formed into a predetermined sectional shape by a plurality of pressure plates in a cylindrical holding frame. The rod-shaped log material is compressed and held, and cooled while being held by the holding frame to form the rod-shaped log into the predetermined cross-sectional shape. In this case, for example, if the cross section of the plurality of pressure plates is fixed to be positioned at a position forming each side of the square, the log can be formed into a prism having a square cross section.

As described above, in this conventional method, a plurality of the holding frames are prepared, and the respective steps for forming can be moved while the wood as the work is set in the holding frames. The process of forming the log into a prism can be continuously performed, thereby improving the productivity.

However, in this conventional method, a plurality of pressure plates mounted on a holding frame are fixed at a closed position and a state where the plurality of pressing plates are moved radially outward from the closed position to be opened. The holding frame becomes large in relation to the diameter of the wood because it is held so as to move between them. In order to move the pressure plate to the above-mentioned two states by the pantograph mechanism using a plurality of links as in the prior art invention, the diameter of the entire holding frame is about three times as large as the log. The handling of the holding frame, that is, the mold, was troublesome. Moreover, the structure was complicated.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a rod-like material which is maintained at a predetermined moisture content and which is heated to a predetermined temperature and which is pressed to a predetermined temperature in a radial direction to have a diameter smaller than that of the wood. It is an object of the present invention to provide a molding method for "molding wood" in which a molding die for the molding can be simplified.

[0006]

Means for Solving the Problems * 1 The technical means of the present invention for solving the above-mentioned problem is as follows: "A cylindrical metal mold having a tapered inner surface large enough to reduce the diameter of the wood in the radial direction. A first step of inserting a piece of wood from a large-diameter-side open end of the molding die to a depth corresponding to the tapered inner surface, and cooling the wood while maintaining the inserted state; And a third step of extruding the product wood after molding with an extruding rod from the small inner diameter side open end of the molding die after the second step.

The above technical means operates as follows. According to the above-described means, the first step of inserting the wood to a position corresponding to the tapered inner surface of the molding die causes the wood to be radially pressed by the tapered inner surface over the entire region in the longitudinal direction, The diameter will be reduced.

After the second step in which the reduced diameter state is maintained for a predetermined time and the temperature of the wood is cooled, the wood is formed into the reduced diameter state and fixed in the formed state to become product wood. . At this time, once heated and cooled, the dimensions are stabilized. The product wood is extruded from the small-diameter end portion in the third step, so that a gap is formed between the product wood and the tapered inner surface, and the formed wood can be taken out from the molding die.

* 2. In the item 1, the "the taper on the tapered inner surface of the molding die substantially coincides with the taper of the uncompressed wood" is uniform over the entire area in the longitudinal direction of the wood. The diameter of the product wood is increased uniformly by the diameter reduction.

* 3. In the above description, "a plurality of recesses are formed in the tapered inner surface of the molding die, and these recesses are long in the axial direction and the depth gradually increases toward the large diameter side of the taper. As it becomes shallower, the starting point on the large diameter side of the recess coincides with the tapered inner surface.'In the surface of the product wood, a convex surface corresponding to the recess is formed. A convex pattern can be provided on the product surface.

* 4. In each of the above-mentioned items, it is characterized in that "the second step is performed at a place different from the first step and the third step". Since the third step is performed at another place, the forming process can be performed continuously. In the above, the inner diameter of the tapered inner surface is 60 mm to 150 mm.
The length of the pressure region in the axial direction is set to 300 mm to 1000 mm, and the taper is 1/10.
In the case of “set to 0 to 1/250”, when the thinned wood of natural wood is used as it is, the whole area can be uniformly compressed by the molding die.

* 5. “A metal tapered cylindrical body open at both ends, having a tapered inner surface for main compression that decreases from an open end on the large-diameter side to an open end on the small-diameter side. , At the large-diameter open end,
It has an introduction taper part with a larger taper than the tapered inner surface for main compression. By using a molding die, wood is pushed into the tapered inner surface for main compression from the introduction taper part at the large-diameter side open end. That is, it is easy to push the wood into the position of the tapered inner surface for main compression. Therefore, each of the molding methods described above can be reliably performed.

[0013]

According to the present invention having the above configuration, the following specific effects are obtained. The forming die for compressing the wood in the radial direction is a cylindrical body with a tapered inner surface, so there is no need for a conventional link mechanism or a movable pressing plate to keep the wood in a compressed state. Therefore, a molding die for compression-molding wood can be greatly simplified.

According to the method described in item 2, in addition to the above effects, the entire area of the wood is uniformly compressed, and the surface strength accompanying the compression becomes uniform. In the method described in Item 3, the surface of the product wood after compression can be made an uneven surface. In the method described in item 4, the compression molding process can be performed continuously. In the molding die described in Item 5, the compression molding of the wood of the present invention can be reliably performed.

[0015]

Next, an embodiment of the present invention will be described in detail with reference to the examples shown in FIGS. This example
As shown in FIG. 1, natural wood such as thinned wood is heated and humidified (or hydrated) so that it can be compression-molded, and then compressed in a radial direction using a molding die (1) (shrinkage). After that, while maintaining this state, the wood and the molding die (1) are heated and cooled to fix the compression molding state, and thereafter, the compression molded wood, that is, the product wood is molded. Mold (1)
It is taken out from. In this example,
The length is 300-1000mm and the taper is 1
The case of compression molding of / 100 to 1/150 will be described.

In order to perform the heating and humidification, in this example,
As shown in FIG. 2, a heating / humidification tank (2) is used. This heating / humidification tank (2) is a horizontal high-pressure tank,
A structure that supports natural wood (10) in multiple stages up and down inside.By heating steam with the openable lid (21) closed, it raises the temperature inside and maintains a predetermined humidity. Is what you do.

Aside from the heating / humidifying tank (2), a device for compression and heating / cooling is additionally provided. As shown in FIG. 3, in order to compress the natural wood (10) in the radial direction, the large-diameter end of the tapered inner surface (16) is higher than the tapered inner surface as shown in FIG. Also, a molding die (1) having a large tapered introduction taper portion (17) is used. The shape of the tapered inner surface (16) of the molding die (1) is the same as that of the natural wood.
Set according to (10), taper is 1/100 ~
1/250, the diameter on the large diameter side is 60 mm to 150 mm, and the length is 500 mm to 1300 mm longer than the natural wood (10) by about 200 mm to 300 mm.

Mold for pressing natural wood (10)
Natural wood (10) on the coaxial line of the push table (11) supporting (1)
There is a first supporting means (12) as a pushing means for pushing the natural wood (10) into the molding die (1) behind the supporting stand (12).
A hydraulic cylinder (31) is provided, and a storage tank (22), a heating tank (20), and a hydraulic cylinder (31) are provided on one side of the pushing table (11) so as to extend in a direction perpendicular to the axis of the molding die (1). A cooling tank (23) is provided, and a transfer crane (5) for transferring the molding die (1) therebetween is provided.The transfer crane (5) is connected to the pushing table (11) and the heating crane (11). The first traveling between the tank (20)
A crane unit (51) and a second crane unit (52) that travels between the heating tank (20) and an extrusion table (14) described later are provided. An extruder (14) for extruding natural wood (10) from the molding die (1) is arranged so as to be continuous with the end point of the transfer crane (5).

The molding die (1) and the natural wood (10) held in a compression-molded state by the molding die (1) move in a storage tank (22) and are put into a heating tank (20) from an end point thereof to be re-used. Heated,
While moving through the cooling tank (23), it is cooled to a predetermined temperature. Through these steps, the natural wood (10) is fixed in a compression molded state. Then, at the end point of the cooling tank (23), the extruding table is moved by the second crane section (52) of the transfer crane (5).
A molding die (1) filled with the natural wood (10) is placed on (14).

The second hydraulic cylinder (32) is mounted on the extrusion table (14) such that the second hydraulic cylinder (32) faces the small-diameter side of the inner diameter of the molding die (1) on the axis of the molding die (1) supported by the extrusion table (14). Is provided.
On the opposite side, a discharge table (15) for transferring and discharging the extruded natural wood (10) is provided.

As described above, the natural wood (10) taken out of the heating / humidification tank (2) and supported by the support (12) is formed by the first hydraulic cylinder (31) as shown in FIG. Pressed into mold (1). In the molding die (1), as shown in the figure, the large-diameter end of the tapered inner surface (16) is an introduction taper portion (17) having a larger taper than the tapered inner surface. Further, the pushing table (11) has a receiving portion (111) with which the small-diameter end of the tapered inner surface (16) abuts, and the molding die (1) supported by the pushing table (11) is The receiving portion (111) prevents movement to the right in FIG. Therefore, as shown in FIG. 6, the natural wood (10) is pushed into the molding die (1) supported and fixed to the pushing table (11) by the above-mentioned pushing, and finally the natural wood (10) is The tapered inner surface (1
6) is maintained.

Thereafter, the output shaft of the first hydraulic cylinder (31) is returned, and the first hydraulic cylinder (31) is transferred from the pushing table (11) to the storage tank (22) by the first crane section (51) of the transfer crane (5). . The molding die (1) is transferred to the storage tank (22) by the transfer chain (24) and reaches the end point (the right end in the figure).
It is pulled up from (22) and put into the heating tank (20).
Molding mold containing natural wood (10) in this heating tank (20)
When (1) is reheated for a predetermined time, the molding die (1) is taken out of the heating tank (20), put into a cooling tank (23), and cooled. A predetermined cooling time has elapsed during the transfer of the cooling tank (23) by the transfer chain (24), and the compressed shape of the natural wood (10) of the molding die (1) is fixed, and the product wood (100) Becomes After that, it is transferred to the extruder table (14) by the second crane section (52).

As shown in FIG. 3, the extrusion table (14)
A receiving portion (111) is provided at an end corresponding to the large-diameter end of the tapered inner surface (16) of the molding die (1). On the opposite side, the output shaft of the second hydraulic cylinder (32) is coaxially opposed to the tapered inner surface (16). The output shaft of the second hydraulic cylinder (32) is pushed into the molding die (1) transferred as described above from the small-diameter end of the tapered inner surface (16) of the molding die (1). With this thrust, natural wood (10) is
It is discharged from the opposite side of (1) to the end of the discharge table (15). Thereby, the natural wood (10) is fixed in a radially compressed state, and the product wood (100) is sequentially transferred to the downstream side of the discharge stand (15). ) Is stocked.

When the molding die (1) has the configuration shown in FIGS. 8 and 9, an uneven pattern is formed on the surface of the product wood (100) simultaneously with the compression molding. This molding die (1)
A plurality of axially long concave fitting portions (4) are formed over the entire inner surface of the tapered inner surface (16), and each of the concave fitting portions (4) has a bottom portion (41) as shown in FIG. It is set parallel to the axis of the molding die (1). Therefore, the end of the concave fitting portion (4) located on the large diameter side of the tapered inner surface (16) coincides with the tapered inner surface (16).

When the natural wood (10) is inserted and held in the tapered inner surface (16) of the molding die (1), the surface of the product wood after compression molding corresponds to a plurality of (4). The projections are formed. The product wood (1
(00) facing the small diameter side of the molding die (1)
When the output wood of (32) is advanced to extrude the product wood (100), the surface of the projection does not hinder the extrusion. If the bottom of the concave fitting portion (4) has an inclined surface intermediate between the axis and the taper of the tapered inner surface (16), the product wood (100) can be extruded more smoothly.

The product wood compression-molded as described above
(100) is used as, for example, a pile, an implanted log for a sidewalk, a floor column, or the like. In the above embodiment, the hydraulic cylinder was used for pushing or pushing natural wood (10).
As long as the output unit is driven linearly, various types of driving devices can be used. The transfer crane (5) was used to transfer from the push-in table (11) to the extrusion table (14), but other transfer means such as a conveyor may be used. It is also conceivable that reheating is performed by a heating means other than the heating tank (20).

The present invention can also be applied to a case where general wood including processed wood is compression-molded in place of the natural wood (10). Further, the molding die (1) is not of a single configuration, but by combining a plurality of vertically divided die members, as shown in the embodiment, the tapered inner surface (16) and the introduction taper portion (17). ).

[Brief description of the drawings]

FIG. 1 is an explanatory view of the whole process of the present invention.

FIG. 2 Heating / humidifying tank (2) with lid (21) open
Illustration of

FIG. 3 is a plan view of the entire apparatus according to the embodiment;

FIG. 4 is a sectional view taken along line XX of the apparatus of FIG.

FIG. 5 is an explanatory diagram of a relationship between respective parts before the natural wood (10) is pressed into the molding die (1).

FIG. 6 is an explanatory view of each part from the middle of pushing natural wood (10) to the end of pushing.

FIG. 7: Product wood (100) from the molding die (1) to the extrusion table (14)
Diagram of operation when extruding

FIG. 8 is a cross-sectional view of a molding die (1) used for molding to continuously form protrusions on the surface of the product wood (100).

FIG. 9 is an enlarged view of a main part of FIG. 8;

[Explanation of symbols]

(1) ・ ・ ・ Molding die, (10) ・ ・ ・ Natural wood, (11) ・ ・ ・ Indentation table,
(12) ... support stand, (14) ... extrusion stand, (15) ... discharge stand, (1
6) ・ ・ ・ Tapered inner surface, (17) ・ ・ ・ Introduction taper part, (100) ・ ・ ・ Product wood, (111) ・ ・ ・ Receiving part, (2) ・ ・ ・ Heating / humidification tank, (2
1) lid plate, (22) storage tank, (23) cooling tank, (24) transfer chain (31) first hydraulic cylinder, (32)・ Second hydraulic cylinder, (4) ... concave fitting part, (41) ... bottom part, (5) ... transfer crane, (51) ... first crane part, (52) ... The second crane part,

Claims (5)

[Claims] 1. A method for forming a rod-shaped wood, wherein a product wood whose diameter is smaller than said wood is formed by radially pressing wood kept at a predetermined moisture content and heated to a predetermined temperature. In the above, a cylindrical molding die having a tapered inner surface having a size that reduces the diameter of the wood in the radial direction is used, and the wood is aligned with the tapered inner surface from the large-diameter side open end of the molding die. A first step of inserting to a depth, a second step of cooling the wood while maintaining the inserted state, and extruding from the small inner diameter side open end of the molding die after the second step And a third step of extruding the formed product wood with a bar. 2. The method of forming a bar-shaped piece of wood according to claim 1, wherein the taper on the tapered inner surface of the forming die substantially coincides with the taper of the uncompressed piece of wood. 3. The method for molding bar-shaped wood according to claim 1, wherein a plurality of recesses are formed in the tapered inner surface of the molding die, and the recesses are long in the axial direction and have a depth. A method of forming a bar-shaped piece of wood in which the taper gradually becomes shallower toward the larger diameter side and the starting point of the larger diameter side of the concave portion coincides with the tapered inner surface. 4. The method of forming a bar-shaped piece of wood according to claim 1, 2 or 3, wherein the second step is performed at a place different from the first and third steps. The method of forming bar-shaped wood. 5. A tapered cylindrical body having both ends open, having a tapered inner surface for main compression that decreases from an open end on the large inner diameter side to an open end on the small inner diameter side, A molding die used for molding bar-shaped wood having an introduction taper portion having a larger taper than the tapered inner surface for main compression at the large-diameter side open end.